JP3120800B2 - Rainfall alarm detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainfall alarm detection device, and more particularly to a rainfall alarm detection device in a radio communication station having an active and a standby transmission / reception system and configured to control switching of the transmission / reception system when a line is deteriorated. It concerns the device.

[0002]

2. Description of the Related Art In a device using a microwave band as a short-range wireless device, a device (N
+1) There are many systems for switching lines by the set backup method. The wireless switching system itself is a known technique.

On the other hand, when a microwave band of 10 GHz or more is used, the attenuation of radio waves due to rainfall is large, and the difference in attenuation between frequency and polarization plane is small.
During rainfall, the radio line uniformly reduces the received electric field strength. In this case, in the system of the set backup method, the line cannot be rescued even if the system is switched to the backup line during rainfall. Further, when switching is performed during rainfall, it is difficult to distinguish between switching due to rainfall and switching due to equipment failure. Therefore, in a rainfall state, a function is required to prevent switching even when a device failure is detected.

For example, in Japanese Patent No. 2735511, two types of line degradation states of the receiving system are detected, and the difference between the occurrence times of the two types of line degradation states is compared. Techniques are described that occur. FIG. 9 is a block diagram showing one embodiment of such a rainfall warning detection circuit. In FIG. 9, the deterioration cause determination circuit 5 generates two signals of the local station spare alarm 5000 and the local station spare alarm 5001 which are generated at different thresholds in the state of deterioration of the protection line, and is generated at different thresholds in the state of deterioration of the working line. It receives the two signals of the local station working alarm 5002 and the local station working alarm 5003, and determines that it is raining when the alarm occurrence time difference in the local station is a predetermined time or more, and outputs the local station rain warning 5004. .

[0005]

The first problem of the prior art shown in FIG. 9 is that when a configuration including an intermediate relay station is used, a rainfall alarm detected by another station cannot be detected. is there. FIG. 10 shows an embodiment of a system configuration including the intermediate relay station. In FIG. 10, when the rainfall occurs only between the terminal station A and the intermediate relay station 1, the intermediate relay station 2
This is because the terminal station B and the terminal station B cannot detect a rainfall alarm at their own station, and may cause unnecessary line switching due to rainfall.

[0006] As another second problem, a rain alarm transmitted from another station may include an error because the transmission source is in a rain state, or a line alarm may occur depending on the rain state of the transmission source. In the event that is completely interrupted, it may not be possible to transfer the rainfall warning itself. In FIG. 10, when the rainfall occurs between the terminal station A and the intermediate relay station 1 and an error occurs in the transfer information, the intermediate relay station 2 and the terminal station B may erroneously cancel the rainfall warning. . Further, if the line during this period is completely disconnected, the intermediate relay station 2 and the terminal station B cannot receive any main signal at all, and therefore, it is possible to detect a rainfall alarm transferred from another station. This is because they cannot.

An object of the present invention is to provide a function of multiplexing a rain alarm detected by its own station on a main signal and transferring it to another station, and detecting a rain alarm generated by another station. It is an object of the present invention to provide a rainfall warning detecting device which solves the above problem.

Another object of the present invention is to provide a function for preventing an erroneous release due to an error by providing a protection time for the release of a rainfall alarm transferred from another station.
Another object of the present invention is to provide a rainfall warning detection device that has the function of maintaining the immediately preceding state when the vehicle is completely disconnected, thereby solving the second problem.

[0009]

According to the present invention, there is provided a structure having a working and a backup transmitting / receiving system, and performing switching control of these transmitting / receiving systems when the line is deteriorated, and not performing this switching control when a rainfall alarm occurs. A rainfall alarm detection device in a radio communication station, wherein the other station rainfall alarm processing means for extending the transfer rainfall alarm from another station by a preset protection time and deriving the same as another station rainfall alarm is provided. A rainfall alarm detecting device is obtained.

[0010] The other station rain alarm processing means has a holding means for holding a state of a transfer rain alarm from the other station immediately before all the working and protection lines are out of frame synchronization. And a means for taking in a transfer rain alarm from the other station preferentially from a line for which frame synchronization is established among the working and protection lines.

[0011] Further, the present invention is characterized by further comprising a deterioration cause judging means for judging a line deterioration due to rain on the basis of the alarm information of the local station working and standby systems and generating a local station rain warning. And a means for deriving a rainfall alert by a logical sum of the other station rainfall alerts. Then, the rainfall alarm based on the logical sum is transferred to the next station.

The operation of the present invention will be described. For example, 10GH
In a radio base station of the (N + 1) set protection method using a microwave band of z or more, when switching between the working line and the protection line due to equipment failure, a method of not performing switching when a rainfall condition is detected, Especially in a system configuration with an intermediate relay station, when transferring and detecting rainfall alarms detected by other stations, a function that can correctly detect rainfall alarms detected by other stations even when the line quality is degraded or when the line is completely disconnected. Provide.

In other words, even when the transfer rain alarm from another station is released, a preset protection time is provided to extend the release time, and all the lines are out of frame synchronization due to the rain. At this time, by retaining the rainfall warning transferred from the other station until immediately before, the rainfall warning of the other station is enabled even when the line is disconnected. In addition, if any of the lines is restored from the complete disconnection due to rain,
By taking in the rain alarm of another station using the restored line, it is possible to accurately take the rain alarm from the other station when the line is restored.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a rainfall alarm detection circuit according to the present invention. As shown in FIG. 1, a rainfall alarm detection circuit 10 according to the present invention detects and generates a local station rain alarm 5004 from a local station preliminary alarm 5000, a local station preliminary alarm 5001, a local station current alarm 5002, and a local station current alarm 5003. A deterioration cause determination circuit 5 is provided.
It has a rainfall alarm selection circuit 1 for other stations, a rainfall warning control circuit 2 for other stations, a total cutoff detection circuit 3, and a rainfall warning determination circuit 4.

The other station rain alarm selection circuit 1 receives the other station spare alarm 1000 and the other station working alarm 1001 as inputs and selects another station according to a preset priority based on the spare frame synchronization signal 3000 and the working frame synchronization signal 3001. Rainfall warning 10
It has a function to output 02. Other station rain alarm control circuit 2
When the selected other station rain alarm 1002 and the complete disconnection signal 3002 are input, and the selected other station rain alarm 1002 is released, the protection time setting causes the line quality to deteriorate and the selected other station rain alarm 1002 is reset erroneously. And a function of fixing the selected other station rain alarm 1002 so as not to be canceled when the line is completely disconnected.

The complete disconnection detection circuit 3 outputs a spare frame synchronization signal.
It has a function of detecting the complete disconnection of a line when all the lines are out of frame synchronization with the input of the 3000 and the active frame synchronization signal 3001, and outputting a complete disconnection signal 3002.
The rainfall warning determination circuit 4 has a function of receiving the local station rainfall warning 5004 and the other station rainfall warning 2001 as inputs, determining a rainfall warning 4000 based on a logical sum thereof, and outputting the result. Therefore, it is possible to obtain the effect that the rain alarm generated in another station can be detected, and the effect that the selected other station rain alarm 1002 can be accurately detected even when the line quality is deteriorated and the line is completely disconnected.

More specifically, in FIG. 1, the other station rainfall alarm selection circuit 1 outputs one of the other station spare alarm 1000 and the other station active alarm 1001 to the spare frame synchronization signal 3000.
Then, the selected other station rain alarm 1002 is output to the other station rain alarm control circuit 2 to be described later. The other station rain alarm control circuit 2 receives the above-mentioned selected other station rain alarm 1002 and a full cutoff signal 3002 described later as inputs,
A rain alarm from another station is controlled in accordance with the line deterioration and the complete disconnection of the line, and the other station rain alarm 2001 is output to a rain alarm determination circuit 4 described later. The details of the other station rainfall warning control circuit 2 will be described later.

The complete disconnection detection circuit 3 outputs a spare frame synchronization signal.
When the frame synchronization signal 3001 is input and the frame synchronization signal 3001 is lost, it is determined that the line is completely disconnected when the frame synchronization loss of all the lines is detected, and the other station rainfall alarm control circuit 2
Output to

The deterioration cause judging circuit 5 is the same as that of the above-mentioned second patent.
No. 735511 discloses a configuration in which a local station spare alarm 5000, a local station spare alarm 5001, a local station active alarm 5002, and a local station active alarm 5003 are input and two types of alarms are generated in each line of the local station. Using the time difference of
The local station detects a rain alarm and outputs a local station rain alarm 5004 to the outside via a rain alarm determination circuit 4 to be described later.

The rain alarm determination circuit 4 is provided with a rain alarm 2001 for another station.
And the local station rain warning 5004 as inputs
Output 4000 to the outside.

Next, the detailed configuration of the other station rainfall warning control circuit 2 will be described. FIG. 2 is a block diagram showing one embodiment of the detailed configuration of the other station rainfall warning control circuit 2. In FIG. 2, the inverter 21 inverts the logic of the selected other station rain alarm 1002 described above. The delay circuit 22 delays the output of the inverter 21 by a predetermined time .tau.2.

The latch circuit 20 outputs the other station rain alarm 2001 using the above-mentioned selected other station rain alarm 1002 as a set signal, the above-mentioned output of the delay circuit 22 as a reset signal, and the above-mentioned all cutoff signal 3002 as a latch signal. Select other station rainfall warning 10
If 02 is an alarm, the other station's rain warning 20
When 01 is set as an alarm and the selected other station rain alarm 1002 is reset, the other station rain alarm 2001 is reset after a time constant τ2 set in the delay circuit 22. Also, when the complete disconnection signal 3002 notifies the complete disconnection,
The other station rain warning 2001 is held in the state immediately before. Time constant τ2
The setting will be described later.

The above-mentioned rainfall alarm detection circuit is used in a (N + 1) -set backup type radio base station for the purpose of circuit rescue in case of equipment failure. FIG. 3 is a block diagram showing an embodiment of a relationship between a rainfall warning detection circuit and peripheral circuits in a base station. In FIG. 3, the RX protection circuit 12 performs a process on a signal from another station received through the radio line, and a local station alarm of a line state in the protection line,
It detects alarms received from other stations, and outputs protection line reception information 1200.

The protection line reception information 1200 includes the other station protection alarm 1000, the protection frame synchronization signal 3000, the own station protection alarm 5000, and the own station protection alarm 5001 in FIG. R
The X working circuit 13 processes a signal from another station received through the radio line in the same manner as the above-mentioned RX protection circuit 12, and separates the own station alarm of the line state in the working line and the alarm received from the other station, respectively. It detects and outputs the working line reception information 1300.

The working line reception information 1300 includes the other-station working alarm 1001, the working frame synchronization signal 3001, the own-station working alarm 5002, and the own-station working alarm 5003 in FIG. The rainfall alarm detection circuit 10 is a block diagram of the entire FIG. 1. The protection line reception information 1200 and the working line reception information 1300 described above are input to detect a rainfall state, and a rainfall alarm 4000 is switched to be described later. The control circuit 3 outputs the self-station rain alarm 5004 to the TX spare circuit 14 and the TX working circuit 1 described later.
5 and output. The TX spare circuit 14 receives the above-mentioned local station rainfall warning 5004 as an input and multiplexes it on the main signal. The TX working circuit 15 is the same as the TX protection circuit 14 and has its own station rainfall alarm.
Multiplex to the main signal with 5004 as input.

A wireless channel system is configured by the wireless base station having the configuration described in FIG. FIG. 4 is an example block diagram. In the terminal A in FIG.
Numeral 0 is the main signal from the transmission line, the switching control signal 1100, the local station rain alarm 5004, and the main signal is transmitted to the wireless line.
The RX circuit 101 outputs alarm information 1010 and 1011 with a main signal from a wireless line as an input. Also, the main signal is transmitted to the transmission path.

The rainfall alarm detection circuit 10 has alarm information 1010
And outputs a local station rainfall warning 5004 and a rainfall warning 4000. The switching control circuit 11 has a rainfall alarm 4000, alarm information
A switching control signal 1100 is output with 1011 as an input. FIG.
Has a configuration similar to that of the terminal station A, and the TX circuit 100,
RX circuit 101, rainfall alarm detection circuit 10, switching control circuit 1
Consists of one.

In the intermediate relay station shown in FIG.
3 receives and transmits the main signal from the wireless line,
Alarm information 1030, 1031 is output, and the local station rainfall alarm 5004,
The switching control information 1100 is input. Rainfall alarm detection circuit 10
Outputs the own station rain alarm 5004 and rain alarm 4000 with the alarm information 1030 as input. The switching control circuit 11 receives the alarm information 1031 and the rainfall alarm 4000 as inputs and receives the switching control information 1100
Is output.

In the system configuration shown in FIG. 4, when line degradation due to rainfall occurs between the terminal station A and the terminal station B,
Unnecessary line switching is stopped by detecting a rainfall alarm transferred from the own station or another station.

The operation of this embodiment will be described below.
FIG. 5 is a time chart showing the operation of the rainfall alarm detection circuit 10 in FIG. 1 when detecting its own station alarm. The deterioration cause determination circuit 5 shown in FIG. 1 includes a local station spare alarm 5000 shown in FIG. 5A and a local station spare alarm 50 shown in FIG.
01, own station alarm working 5002 shown in FIG. 5 (c), FIG.
Input the local station working alarm 5003 represented by (d).

The local station spare alarm 5000 and the local station spare alarm 5001 are alarms having different thresholds related to the line state of the spare line in the local station apparatus.
After the alarm occurs, the local station backup alarm 5001
If no error occurs, it is determined that the line has deteriorated due to rain. Similarly, the local station working alarm 5002 and the local station working alarm 5003 are alarms having different thresholds related to the line state of the working line in the local station apparatus, and determine the line deterioration due to rainfall using the same time constant τ1.

In the present embodiment, when a rainfall alarm is detected on both the self-station protection line and the self-station working line, the self-station rainfall alarm is determined, and the self-station rainfall alarm is determined based on the waveform shown in FIG. The station rain warning 5004 is output. Rainfall warning judgment circuit 4 shown in FIG.
Receives the local station rain alarm 5004 shown in FIG. 5 (e) and the other station rain alarm 2001 shown in FIG. 5 (f), and receives the local station rain alarm 5004 and the other station rain alarm 2001. And outputs a rainfall warning 4000 with a waveform shown in FIG. 5 (g).

The operation flow shown in FIG. 5 will be described. At timing t1 in FIG. 5, the local station backup alarm 15000 becomes an alarm and changes from "L" to "H". Further, at timing t2 in FIG. 5, the local station working alarm 5002 becomes an alarm, and changes from “L” to “H”. At time t3 in FIG. 5 when the time constant τ1 has elapsed from timing t2, it is determined that the line is deteriorated due to rainfall because both the local station spare alarm 5001 and the local station working alarm 5003 are in the normal state “L”. , Its own station rain alarm 5004 becomes an alarm and changes from “L” to “H”. At the same time, the rainfall warning 4000 also becomes an alarm, and changes from “L” to “H”.

At timings t4 and t5 in FIG. 5, the local station backup alarm 5001 and the local station working alarm 5003 become alarms, respectively, and change from "L" to "H", but do not affect the output. After that, at the timing t6 in FIG. 5, the local station preliminary alarm 5001 is released and changes from “H” to “L”, so that the local station rainfall warning 5004 is released and changes from “H” to “L”. At the same time, the rainfall warning 4000 is also canceled and changes from “H” to “L”. At time t7 in FIG. 5, the local station working alarm 5003 is released.
The local station rain warning 5004 has already been released. Thus, the operation of detecting the rainfall alarm by the own station alarm is performed.

Next, the operation when the other station alarm is detected will be described. FIG. 6 is a time chart showing a rainfall alarm detection operation when a rainfall alarm is detected at another station. 1 and 6
In FIG. 6, the other station rainfall alarm selection circuit 1 shown in FIG.
The other station spare alarm 1000 shown in FIG. 6A and the other station working alarm 1001 shown in FIG.
The spare frame synchronization signal 3000 shown in (b) and FIG.
The selected other station alarm 1002 is output in the waveform selected in accordance with the priority set by the active frame synchronization signal 3001 and the waveform shown in FIG. This priority will be described later.

The protection frame synchronization signal 3000 is a signal for detecting frame synchronization on the protection line, and the working frame synchronization signal 3001 is a signal for detecting frame synchronization on the working line. The other station rainfall alarm control circuit 2 in FIG. 1 receives the above-mentioned selected other station alarm 1002 and inputs it to FIG.
The other station rain warning 2001 is output with the waveform shown in FIG. The rainfall alarm determination circuit 4 shown in FIG. 1 performs the rainfall with the waveform shown in FIG. 6H by the logical sum of the above-mentioned other station rainfall alarm 2001 and the own station rainfall alarm 5004 shown in FIG. Output alarm 4000.

The operation flow shown in FIG. 6 will be described. At timing t8 in FIG. 6, the other station spare alarm 1000 and the other station active alarm 1001 become alarms, and change from "L" to "H". Therefore, select other station alarm 1002, other station rain alarm 20
01 becomes an alarm and changes from "L" to "H". At the same time, the rainfall warning 4000 also becomes an alarm, and changes from “L” to “H”.
Becomes Thereafter, at the timing t9 in FIG. 6, the other station spare alarm 1000 and the other station current alarm 1001 are reset to "L" from "H", so that the selected other station alarm 1002 is reset to "L". From "H" to "L", the other station rainfall warning 2001 holds the alarm state.

Timing t10 in FIG. 6 after the elapse of the time constant τ2
In, the other station rainfall warning 2001 was canceled and the "H"
To “L”. At the same time, the rainfall warning 4000 is also released, and changes from “H” to “L”.

Next, selection of the other station rain alarm when the frame synchronization is lost and control of the other station rain alarm when the frame is completely disconnected will be described. FIG. 7 is a time chart illustrating a rainfall warning detection operation when frame synchronization is lost. 1 and 7, FIG.
The other station rainfall alarm selection circuit 1 receives the other station spare alarm 1000 shown in FIG. 7A and the other station working alarm 1001 shown in FIG. 7B. The other station is selected according to the priority set by the spare frame synchronization signal 3000 shown in FIG. 7 and the working frame synchronization signal 3001 shown in FIG. 7D, and selected by the waveform shown in FIG. alarm
Outputs 1002.

The spare frame synchronizing signal 3000 and the working frame synchronizing signal 3001 are input to the complete disconnection detection circuit 3 in FIG. 1 and output a complete disconnection signal 3002 with a waveform shown in FIG. The other station rain alarm control circuit 2 of FIG. 1 receives the above-mentioned selected other station alarm 1002 and the above-mentioned all cutoff signal 3002 and outputs the other station rain alarm 2001 with the waveform shown in FIG. 7 (g). . The rain alarm determination circuit 4 shown in FIG. 1 performs a rain alarm with the waveform shown in FIG. 7 (i) by the logical sum of the above-mentioned other station rain alarm 2001 and the own station rain alarm 5004 shown in FIG. 7 (h). 4000
Is output.

The priority set by the other station rain alarm selection circuit 1 shown in FIG. 1 is preferentially selected from the line for which frame synchronization is established between the protection line and the working line, and the other station alarm 1002 is selected. It is a ranking set so that it can be done. In the operation in FIG. 7, the spare frame synchronization signal 3000
When both the normal frame synchronization signal 3001 and the active frame synchronization signal 3001 are in the normal state or both in the alarm state, the selected other station alarm
The example shows a case where the setting is made such that the other station auxiliary alarm 1000 is selected as 1002.

If only the spare frame synchronization signal 3000 is an alarm, the other station current alarm 3001 is selected as the selected other station alarm 1002, and if only the current frame synchronization signal 3001 is an alarm, the selected other station alarm 1002 is selected. The figure shows a case where the setting is made such that the station backup alarm 3000 is selected. The priority set by the other station rain alarm selection circuit 1 can be set arbitrarily by the user as described above.

The operation flow shown in FIG. 7 will be described. At timing t11 in FIG. 7, the other station spare alarm 1000 and the other station active alarm 1001 become alarms, and change from "L" to "H".
Becomes Therefore, select other station alarm 1002, other station rainfall alarm
2001 becomes an alarm, and changes from “L” to “H”. At the same time, the rainfall warning 4000 also becomes an alarm, and changes from “L” to “H”.
Becomes At the timing t12 in FIG.
1000 is reset and the alarm is changed from "H" to "L".
It changes from “H” to “L”. However, the other station rainfall alarm 2001 keeps the alarm until the release protection time τ2, so that the alarm continues.

At timing t13 in FIG. 7, the spare frame synchronization signal 3000 becomes an alarm, and changes from "L" to "H". Therefore, according to the priority order of the other station rainfall alarm selection circuit 1, the selected other station alarm 1002 is the other station current alarm.
Since 1001 is selected, the alarm is held "H". At the timing t14, the other-station active alarm 1001 is reset and the status is changed from "H" to "L".
The alarm is also reset to 1002, and the alarm is changed from H "to" L ".

At timing t15 in FIG. 7, the active frame synchronization signal 3001 becomes an alarm, and changes from "L" to "H". Since both the protection line and the working line are out of frame synchronization, the complete disconnection is detected and the complete disconnection signal 3002 becomes an alarm. It changes from “L” to “H”. When the total cutoff signal 3002 is an alarm, in the other station rain alarm control circuit 2, the other station rain alarm 2001 is held in a state, so that the other station rain alarm 2001 is in alarm holding "H". Thereafter, at timing t16 in FIG. 7, the other station spare alarm 1000 and the other station working alarm
Both 1001 become the alarm "H", and both the spare frame synchronization signal 3000 and the working frame synchronization signal 3001 become the alarm release "L".

Therefore, the all cutoff signal 3002 is released from the alarm, and changes from "H" to "L". Select other station alarm
1002 selects the other station spare alarm 1000 from the priority order and becomes an alarm, and changes from "L" to "H". At this time, the other station rain alarm 2001 and the rain alarm 4000 become the alarm continuation “H”. At the timing t17 in FIG. 7, the other station spare alarm 1000 and the other station active alarm 1001 are both cleared of the alarm and changed from "H" to "L". Therefore, the selected other station alarm 1002 is cleared of the alarm and changed from "H" to "H". Although it becomes "L", the other station rain alarm 2001 and the rain alarm 4000 are kept in the alarm state until the release protection time .tau.2 and become "H".

At the timing t18 in FIG. 7, since the release protection time τ2 has elapsed, the other station rain alarm 2001 is reset from “H” to “L” and the rain alarm 4000 is also reset from “H”. It becomes “L”.

Here, the release protection time τ2 in the other station rainfall alarm control circuit 2 of FIG. 1 will be described. FIG. 8 is a time chart showing the relationship between the other station alarm and the frame synchronization signal. In FIG. 8, a spare frame synchronization signal 3000 indicated by (a) is a signal indicating the frame synchronization state of the spare line. The other station backup alarm 1000 represented by (b) is other station alarm information received on the protection line.

In FIG. 8, at time t19, the other station backup alarm 1000 changes from "H" to "L", and the alarm is released. However, at time t20 after time constant τ3,
The spare frame synchronization signal 3000 becomes an alarm, and changes from “L” to “H”. Normally, the frame synchronization signal has a guard time for establishing and releasing the synchronization, and the frame synchronization is lost from the frame synchronization state when an error continues for the guard time or more. Therefore, it is indistinguishable whether the alarm release of the other station preliminary alarm 1000 at the timing t19 in FIG. 8 is a normal alarm release or a data error during the frame synchronization protection time.

In the present invention, when the protection time for releasing the frame synchronization is τ3, the other station alarm release protection time τ2 satisfying τ2> τ3 is defined. FIG.
After the other station preliminary alarm 1000 is released at the timing t19, the other station alarm is held during the other station alarm release protection time τ2 in consideration of the possibility of the frame synchronization release protection time. Thereafter, at time t21 in FIG. 8, if the other station preliminary alarm 1000 is in the alarm released state, the alarm release is determined. Also, at timing t22 in FIG. 8, the spare frame synchronization signal 3000 is released from the alarm and changes from "H" to "L", and at the same time, the other station preliminary alarm 1000 becomes an alarm and changes from "L" to "H".

In this embodiment, the rainfall alarm is detected in the own station using the deterioration cause judgment circuit 5, but a rainfall sensor external to the apparatus can be used instead of the deterioration cause judgment circuit 5. Also, the (1 + 1) configuration including one working line and one protection line has been described. However, the number of working lines is not limited, and the (N + 1) configuration including the working N line and one protection line is also possible. Obviously it is applicable.

[0052]

The first effect is that a rainfall warning can be correctly detected by rainfall warning information transferred from another station. The reason is that, depending on the frame synchronization state of each line, it is possible to take in rainfall warning information from other stations from the line in the frame synchronization state, and to prevent the rainfall alarm from being accidentally released due to a data error immediately before frame synchronization loss. To have. Also, if a complete disconnection is detected,
This is because, by holding the rain alarm from the other station, even if the rain alarm of the other station cannot be received during a complete cut, a function of detecting the rain alarm state is provided.

A second effect is that a rainfall warning can be correctly detected even in a system configuration including many intermediate relay stations. The reason is that, in a system configuration including a large number of intermediate relay stations, it is necessary to transfer information about rainfall occurring between any two stations to other stations, but due to the first effect, it is necessary to transfer information to other stations. This is because the rainfall warning can be correctly detected based on the rainfall warning information transferred from.

The third effect is that the circuit configuration is easy and LS
It is advantageous for I The reason is that the game rain alarm control circuit and the total cutoff detection circuit installed in the present invention can be constituted by a simple logic circuit or a combination circuit.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a detailed block diagram of another station rainfall warning control circuit 2 of FIG. 1;

FIG. 3 is a block diagram showing a connection form of a rainfall warning detection circuit according to the embodiment of the present invention with other circuits in the apparatus.

FIG. 4 is a block diagram illustrating an example of a system configuration of a wireless station having a rainfall warning detection circuit according to an embodiment of the present invention.

FIG. 5 is a timing chart showing a rainfall warning detection operation based on a local station alarm according to the embodiment of the present invention.

FIG. 6 is a timing chart showing a rainfall warning detection operation by another station alarm according to the embodiment of the present invention.

FIG. 7 is a timing chart showing another station rainfall warning detection operation at the time of occurrence of frame synchronization loss and total disconnection according to the embodiment of the present invention.

FIG. 8 is a timing chart showing an operation of another station alarm when frame synchronization is lost.

FIG. 9 is a diagram showing an example of a conventional rainfall warning detection circuit.

FIG. 10 is a block diagram for explaining a problem of rainfall alarm detection in a system configuration of a wireless station including an intermediate relay station.

[Explanation of symbols]

 Reference Signs List 1 Other station rain alarm selection circuit 2 Other station rain alarm control circuit 3 Total cutoff detection circuit 4 Rain alarm judgment circuit 5 Deterioration cause judgment circuit 10 Rain alarm detection circuit 20 Latch circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/74 G08B 21/00 G08B 25/00 520 G08B 29/06 H04B 7/00

Claims (6)

(57) [Claims] An apparatus for detecting a rainfall alarm in a wireless communication station having an active and a backup transmission / reception system, performing switching control of these transmission / reception systems when a line is deteriorated, and not performing the switching control when a rainfall alarm occurs. A rainfall alarm detection device, comprising: another station rainfall warning processing means for extending a transfer rainfall warning from another station by a preset protection time and deriving the same as another station rainfall warning. 2. The other station rain alarm processing means, when all the working and protection lines are out of frame synchronization,
2. The rainfall alarm detection device according to claim 1, further comprising a holding unit for holding a state of the rainfall alarm transmitted from the other station immediately before the detection. 3. The another station rain alarm processing means includes means for taking in a transfer rain alarm from the other station preferentially from a line of which the frame synchronization is established among the working and protection lines. The rainfall warning detection device according to claim 1 or 2, wherein: 4. The apparatus according to claim 1, further comprising: a deterioration cause judging means for judging a line deterioration due to rainfall based on alarm information of the local station working and protection systems and generating a local station rainfall warning. The rainfall alarm detection device according to the above. 5. The rainfall warning detection device according to claim 4, further comprising means for deriving a rainfall warning by a logical sum of the local station rainfall warning and the other station rainfall warning. 6. The rainfall warning detection device according to claim 5, wherein the rainfall warning based on the logical sum is transferred to a next station.